Gas sensor investigation based on a catalytically activated thin-film thermopile for H2O2 detection

✍ Scribed by Patrick Kirchner; Yue Ann Ng; Heiko Spelthahn; Andreas Schneider; Hartmut Henkel; Peter Friedrich; Jens Kolstad; Jörg Berger; Michael Keusgen; Michael J. Schöning

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 489 KB
• Volume: 207
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200983309

✦ Synopsis

Abstract

In aseptic filling systems, hydrogen peroxide vapour is commonly used for the reduction of microbial contaminations in carton packages. In this process, the germicidal efficiency of the vapour depends especially on the H~2~O~2~ concentration. To monitor the H~2~O~2~ concentration, a calorimetric H~2~O~2~ gas sensor based on a catalytically activated thin‐film thermopile is investigated. Two different sensor layouts, namely a circular and a linear form, as well as two various material pairs such as tungsten/nickel and gold/nickel, have been examined for the realization of a thin‐film thermopile. Additionally, manganese oxide and palladium particles have been compared as responsive catalysts towards H~2~O~2~. The thin‐film sensors have been investigated at various H~2~O~2~ concentrations, gas temperatures and flow rates.